Data Management Method in Storage Pool and Virtual Volume in Dkc

1. A storage system comprising: a first storage apparatus coupled to a computer; and a second storage apparatus coupled to the first storage apparatus and the computer, wherein: the first storage apparatus includes: first physical storage devices accessed by the computer; and a first control unit for controlling the first physical storage devices; and the second storage apparatus includes: second physical storage devices; and a second control unit for controlling the second physical storage devices, wherein: a first logical device which corresponds to a storage area that is set in at least one of the first physical storage devices and a second logical device that is a virtual storage device, wherein: the first control unit transmits system constitution information of the storage system to the second storage apparatus; the second control unit constitutes a third logical device and a fourth logical device based on the constitution information; the third logical device corresponds to a storage area that is set in at least one of the second physical storage devices; and the fourth logical device is the virtual storage device, wherein: when write data to the second logical device from the computer is received: the first control unit: allocates a certain storage area of the second logical device for each storage area of the first logical device and the third logical device; stores the write data to the allocated storage area of the first logical device; and transmits the write data to the second storage apparatus; and the second control unit: stores the write data to the allocated storage area of the third logical device.

2. The storage system according to claim 1 , wherein: the first control unit: manages correspondence relationship information of a certain storage area of the second logical device and each storage area of the first logical device and the third logical device; and transmits the first mapping information, and wherein: the second control unit: manages a second mapping information correspondence relationship of a certain storage area of the fourth logical device and each storage area of the first logical device and the third logical device; and changes the second mapping information based on the first mapping information.

3. The storage system according to claim 1 , wherein the third logical storage device is configured in the same manner as the at least one of the first physical storage devices, and wherein the fourth logical storage device is configured in the same manner as the at least one of the second physical storage devices.

4. The storage system according to claim 1 , wherein the second storage apparatus is a remote storage apparatus.

5. A method comprising: providing a first storage apparatus coupled to a computer; accessing, by the computer, first physical storage devices included in the first storage apparatus; controlling, by a first control unit included in the first storage apparatus, the first physical storage devices; providing a second storage apparatus coupled to the first storage apparatus and the computer, wherein the second storage apparatus includes a second physical storage devices and a second control unit; controlling, by the second control unit, the second physical storage devices; providing a first logical device which corresponds to a storage area that is set in at least one of the first physical storage devices and a second logical device that is a virtual storage device; transmitting, by the first control unit, system constitution information of the storage system to the second storage apparatus; constituting, by the second control unit, a third logical device and a fourth logical device based on the constitution information, wherein the third logical device corresponds to a storage area that is set in at least one of the second physical storage devices and wherein the fourth logical device is the virtual storage device; when write data to the second logical device from the computer is received, allocating, by the first control unit, a certain storage area of the second logical device for each storage area of the first logical device and the third logical device; storing, by the first control unit, the write data to the allocated storage area of the first logical device; transmitting, by the first control unit, the write data to the second storage apparatus; and storing, by the second control unit, the write data to the allocated storage area of the third logical device.

6. The method according to claim 5 , further comprising: managing, by the first control unit, correspondence relationship information of a certain storage area of the second logical device and each storage area of the first logical device and the third logical device; transmitting, by the first control unit, the first mapping information; managing, by the second control unit, a second mapping information correspondence relationship of a certain storage area of the fourth logical device and each storage area of the first logical device and the third logical device; and changing, by the second control unit, the second mapping information based on the first mapping information.

7. The method according to claim 5 , wherein the third logical storage device is configured in the same manner as the at least one of the first physical storage devices, and wherein the fourth logical storage device is configured in the same manner as the at least one of the second physical storage devices.

8. The method according to claim 5 , wherein the second storage apparatus is a remote storage apparatus.